Reinforced-concrete floor structure.



J. R. ODONNELLK REINFORCED CONCRETE FLdOR STRUCTURE; APPLICATION FIL EDJUNE 23. I 9 I6.

1,217,985. Patented Mar. 6, 1917.

WITNESSES 1 l/Vl/E/VTOR A TTOB/VE Y -JOHI*T It. ODONN'ELL, OF BROOKLYN,NEW YQBK.

REINFORCED-CONCRETE rnoon s'rnuc'runn.

To all whom it may concern:

Be it known that I, JOHN QDonnnnn,

- a citizen of the United States, residing in disposed at the top,supports the blocks, are inverted, their slab the borough of Brooklyn,city of New York, county of Kings, and State of New York, have inventednew and useful Improvements in Reinforced-Concrete Floor Structures, ofwhich the following is a specification.

The invention relates to reinforced concrete flat slab floor structuresand more particularly to that type wherein hollow of terra cotta,gypsum, or some other material of greater compressive value thanconcrete, are incorporated ,as structural members and fillersbetweenreinforced concrete beams. The object is to secure the greatestadvantage in theuse of such blocks for compression, and thereby tosecure a stronger floor with less dead weight or to permit theconstruction of longer spans than heretofore. This is accomplished by acombination of reinforced concrete beams and inter- Vening blocks of thecharacter indicated, the blocks having thickened slab portions, which inthe central or major part of the span are while at and near the portionsbeing at the bottom, to take care of negative compression, which existsat these regions and which may bemuch greater than the positivecompression elsewhere. By this construction I eliminate a large amountof useless concrete which ordinary fiat slab floors are required tocarry at the bottom, at the center of the span, and at the top, over andadjacent the columns,thereby light-- ening the floor and avoiding thesevere local stresses which result from such dead weight, and at thesame time I insure sufiicientina- 'terial for compression at the placeswhere it is needed, all of this being accomplished by the form of theblocks and, more especially, the use of blocks of one kind, which merelyrequire to be inverted at the points where the compression changes.

In the accompanying drawings illustrating the invention:

Figure 1 is a. vertical section through a floor span constructed inaccordance with the invention; a

Fig. 2 is a perspective plan view of a section of the floor constructedon a twoway system.

Structural members carry ng the floor Specification of Letters Patent.

'erably arranged on spaces blocks Patented Mar. a, rare.

' Application filed June 23,1916. Serial no. 105,331.

and marking the ends of the span are indicated at al The concrete beamsI) are prefa twofway system, that is to say, running at right angles toeach other, with the spaces between them tangular, though this is notessential. The

istic of which is not only that they have one greatly thickened wall dforming a heavy slab portion, the opposite wall being of or dinarythickness or relatively thin, but that in the central part of the spanthis slab portion of the blocks is at the top while toward the supportsit is at the bottom, the inversion of the blocks occurring.- at pointscorresponding approximately to a change in compression from positive tonegative, that' between beams are filled by hollow, open-end terra cottablocks 0, the characterversed in position correspondingly to the slabs.

What I claim as new is: 4 1. A flat slab reinforced concrete floorcomprising reinforced concrete beams with hollow blocks between thebeams, said blocks having thickened heavy slab portions at one side ofthe central horizontal plane, the

blocks in the central partof the span having their slab portions at thetop and those near the supports being inverted with their slab portionsat the bottom.

2. A composite floor composed of hollow blocks and reinforced concreteforming a fiat slab, the blocks comprising an identical form havingonethickened heavy slab portion, the said blocks being relativelyinverted in different parts of the slab, those in the having theirthickened slab central portion and those over the supportions at the topports having their slab portions at the bottom.

Dated this 22nd dayof June, 1916. JOHN R. ODONNELL. Witnesses:

Gr. H. COMrnnr,

A. KELLEY.

